Open-hearth lead-furnace



2 Sheets-Sheet 1.

("No Model.)

, E. R. MQFFBT. OPEN HEARTH LEAD FURNAUE.

No. 309,556. Patented Dec. 23, 1884.

(No Model.) 2 SheetsSheet 2.

E. R. M'OFFET.

OPEN HEARTH LEAD FURNACE. No. 309,556. I Patented Dec. 23, 1884.

Written draws Farasrr Ditties,

ELLIOT"? It. MOFFET, OF JOPLTN, MiFiSOURI.

OPEN t-iEARTi-i LEAD FURNACE.

SPECIFICATION forming part of Letters ?atent No. 309,556, dated December23, 1884.

application filed May 14.1884. (No model.)

To all whom it may (IO/LCCVIL.

Be it known that I, ELLIOTT R. hl'omrnr, of

Joplin, Jasper county, and State of Missouri,

have invented a new and useful Improvement in Open-Hearth Lezul-Iurnaees, of which the following is a full, true, and accuratedescription, reference being bad to the accompanying drawings, whichform a part of this specification.

The object of my invention is to increase the production and economizefuel in an open hearth furnace, and at the same time to diminish thelabor usually required in attending them. vThis I accomplish by makingmy furnace double, in the manner hereinafter described, and by providingit with appliances for heating the air before itenters the tuyeres,

whileat the same time such air is made to keep the walls of the fur-nacesuliiciently cool, and the tuyeres are also kept from becoming too hot.

Reference being now .had to the drawings, Figure l. is a cross-sectionalview of my double furnace on the line 00 :0 of Fig. 2.

Fig. 1. Fig. 3 is a sectional view of the side of the furnace on theline of Fig. 2, and Fig. i is a sectional view of the dividing-wallnace, as A, Figs. 1 and 2, is provided with a tube or coveredpassage-way, a, leading from the bottom of said sole-plate to a gutter,Z), placed to one side of the work-stone B. As the melted metallic leadrises in the sole-plate r it flows from the bottom of said plate intothe gutter b, and thence into the ordinary casting-pot.

D, Figs. 1 and 4, is a cast-iron partition which divides the casting,forming the sole- Fig. 2 is a plan view of the same on the section y 7of plates and work-stones into two parts or furnaces, and (Z, Figs. 1and 4, is a tube or aperture formed in said casting, by which the meltedlead in the sole-plate A is allowed to flow into the sole-plate A, sothat the product of both furnaces flows out through a single gutter, I).

E is a cast-iron box or trouglnadapted to be placed upon the casting D,and to form part of the same dividing-wall. It is kept full of flowingwater, which enters at its bottom by means of the pipe 0. and ilows outat its top through the pipe 0. This water surrounds the tuyeres F, whichmay either form a part of the box i or be placed in the same. Thetuyeres F, as shown in Figs. 1, 2, and 3, are arranged in a line at theback of each furnace; and I prefer to use a large number, so that allparts of the furnace may be amply provided with the air-blast. Infurnaces of ordinary size, six, as shown in the drawings, I have foundto give good results.

G is a cast-iron plate made to fit and cover the top of the box E, andit is provided with holes g, which register with the holes in thetuyeres F. The top of this plate is provided wit-h three ridges, whichiit into corresponding depressions in the casting H.

ll is a hollow cast-iron box provided with a partition, 7/, whichdivides it into two independenta-ir conduits or flues, I and 1. It setsupon and is fitted to the lid G of the tuyerebox IE, said lid serving asits bot-tom. The lines l and 1 communicate, respeotively,with the duesformed in the side walls of the furnace by means of openings l and t"formed in the box If.

The partition or dividing wall made up, as above described, of thecastings D, E, and, H, forms, as will be seen, the back of each of thefurnaces.

J" and J are the side walls of the furnace, which are also made ofcast-iron and are 1101- low. They are provided with openings marked 1iand K, respectively, for the admission of air, and have partitions Lcast or inserted in them. They have also openings j and j,which registerwith the openings 13 and z" of the box H.

M is the chimney or stack, which is supported upon the side walls, J J,in the manner shown in Figs. 1, 3, and l.

In operation my furnace is charged in the usual manner. An air-blast isforced through the openings K and K into the lowerparts of the hollowside walls, J and J, and the blast is forced to each end of the sidewalls by means of the deflecting-plates L, after passing around the endsof which it passes through the upper parts of the side walls to theopeningsj and j, through which it enters the flues I and I, in which itis distributed to the tuyeres F. The air of course, before reaching thetuyeres, is highly heated by reason of its extended contact with the hotwalls of the furnace, and these walls are at the same time kept belowthe temperature at which cast-iron is injured in the operation of thesefurnaces.

The even distribution of the hot blast through the multiple tuyeresenables my furnace to work the most refractory ores, and the operationis carried on at greatly-increased speed and relative diminution offuel. Labor is also saved by reason of the fact that, as constructed byme, both furnaces deliver their metal through a single gutter.

It will be obvious to one skilled in the art that my furnace can be usedfor roasting refractory lead and silver ores as well as for smeltingthem, and I have found it to give excellent results when so used.

I have described my improvements as applied to a double furnace; but, aswill be readily seen, the hollow iron walls with their deflecting-platesand distributing-apertures and the water-box for the multiple tuyerescan as readily be applied to a single as to a double furnace.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A double lead-smelting furnace consisting of an iron platformconstituting the soleplates and work-stones of both furnaces, having apassage, a b, on one side for the escape of the lead, and provided witha partitionwall having the opening (I, substantially as shown anddescribed.

2. A lead-smelting furnace having its sides made of hollow iron castingsprovided with deflecting-plates L, and its back made of a hollow ironcasting opening into the hollow side walls, and provided with aperturesfor distributing air to the tuyeres, substantially as shown anddescribed.

3. A lead-smelting furnace having its sides madc'of hollow iron castingsprovided with deflecting-plates L, and its back made of a hollow ironcasting opening into the hollow side walls, and provided with aperturesfor distributing air to the tuyeres, and having said tuyeres arranged ina line in the back of boX, forming a part of the back of the furnace,

substantially as shown and described.

5. A furnace for lead-smelting,in which the air. used for the blastcools the hollow sides and back of the furnace and at the same timebecomes itself hot and is forced into the furnace through tuyeres placedin a portion of the hollow back of the furnace and cooled by a runningstream of water, substantially as shown and described.

6. A double lead-smelting furnace having its side walls made of hollowcast-iron, pro

vided with deflecting-plates L, and its back made up in part of a hollowcasting provided with the flues I I, adapted to register with openingsin the hollow side walls, in combination with multiple tuyeres openinginto said flues, substantially as shown and described.

7. A double lead-smelting furnace having its side walls made of hollowcast-iron, provided with deflecting-plates L, and its back made up inpart of a hollow casting provided with the fiues I I, adapted toregister with openings in the hollow sidewalls, in combination withmultiple tuyeres situated in a Waterbox forming part of the back of thefurnaces, substantially as shown and described.

8. In a double lead-smelting furnace substantially as described, acast-iron back con sisting of a casting, D, having a perforation, d, incombination with a cast-iron tuyere-box, E, having water-pipes e and e,and a cast-iron flue-box, H, having openings to admit the blast of airand to distribute the same to the tuyeres.

In witness whereof I have hereunto set my hand.

ELLIOTT It. MOFFET.

Witnesses:

A. V. STILLWELL, D. K. WEN IOH.

